Brake testing mechanism



April 30, 1935. w. A. ROSS BRAKE TESTING MECHANISM Filed Feb. 9, 1932 5 Sheets-Sheet 1 Z? I {d j 4 30 if 11H 0 llomey A ril 30,1935. w. A. ROSS 1,999,947

BRAKE TESTING MECHANI SM Filed Feb. 9, 1952 s Sheets-Sheet 2 fl j '35 A? v A? I O f :O I W (I' ""f' l I 9 I HM z zlzdwdfiss Inventor- By 6 j flitorney April 3o,1935.= w. A. R055 1,999,947

BRAKE TESTING MECHANI SM Filed Feb. 9, 1932 3 Sheets-Sheet 3 Inventor lli arrhd fass l "f PAT I This. invention 'appertains tolnew the following specification.

Patented Apr. 30, 1935 1 n QE-TESI INGMECHANI M williamzAr Ross, Spring-field, m. I Application February a, 1932.;serieinb. 591,859.

and useful improvements for means for testing brakeson automobiles, airplanes and. other vehicles, having a braking system. I i

The principal object of this invention} is to providea braketesting mechanism operative to test the. brakes of an airplane or vehicle while the airplane or vehicle is being driven-or landed. Another. important object of the invention is to provide a brake testing mechanism which will indicate to the driver. of a vehicle .orairplane the condition of his brakeswhile he is driving.

Other important objects. andadvantages of the inventionfwill become apparent'to. the reader of Inthe drawings:- i (Figure lrepresents a top plan view of} an automobile chassis showing the wheel mountand the' connections between the various brakes and the indicating means. i

Fig. 2 represents a. fragmentary verticallsectional viewshowing the interior of one, of; the brakes. p T i Fig. 3irepresents a, vertical sectional viewv taken substantially on line 3,3- of Fig. .2. Fig. 4' represents a fragmentarydetailed. sectional View taken substantially on, line 4- 4j of} Fig. 2.

Fig. 5 representsa fragmentary detailed" sec:

- tional view taken substantially 'on lin 5?5.' of

Fig. 4. V

Fig.' 6represents a front elevational view of the indicating instrument.

Fig. 7 represents a sectional view taken substantially on line !-1 of Fig. 6.

Fig. 8 represents a perspective view of one of the marker hands.

Fig. 9 represents a the indicator arms.

Fig. 10 represents a side elevational view of one of the pressure responsive mechanisms of the indicator.

Fig. 11 represents a setting device.

Referring to the drawings wherein like numerals designate like parts, it can be seen in Fig. 1 that numeral 5 represents the chassis frame of an automobile provided with the front axle bar 6 and the rear axle housing 1 through which the axle 8 extends.

As the brake assemblies are all substantially identical in construction, a description of one of the rear brake assemblies will suffice for the other.

Referring to Fig. 3, it can be seen that the rear perspective view of one of perspective view of the re-v ra e assem l eprese t d onsist fa ollar 9 on the adjacentendofthe axlehousinglbea and the axle 8-is the rollerbearing Numeral H represents the hub of the the spokes; I2,

tween; which: mount Hi. adjacen wh i'f om he i Numeral l3v represents the cylindrical brake m wh ch is s r d thewheel Numeral i5 dust plate secured to the flange I6 3 and-is at the inside In conventional types; of brake the tie plate i-T, Which. is the anchor plate'for bythespoke; bolt l4 to represents a disk-shaped;

on thecollar end' of-the drum l3.

mechanisms,

the brakeshoes l8-,-| 8 is fixed tothe collar 9-; but

n the present case, the same is provided with anenlargedring l9'which afiordsabearing, this ring; being rotatable-on the collar 9. so that-the the'collar 9. To

tie-plate. H; isfree to. swing on the lower end of the plate l-l the 10w er ends of the shoes |8 l8. a r,e pivotally connected asatv 20..- and immediately isthe one barrel 23 havingthe: boss 24. gaging the tie plate-i1 at the the spring. under brakes are released.

soas to place sion when the of the barrel, end Qith ha r ii if' is t p un r. ing cup 26iis provided at the in plunger and interposed between'this cup. and the closed end of the barrel 23 is a coiledcom pressible spring 27.

nerend of the A nipple-like extension 28 is provided on the outer end of the plunger 25 anda dust-proof web 29 of tubular construction has one end secured to the open end portion of the barre and at its opposite as at 3 I.

The barrel 23 is 123 as at 30 nd to the nipple-structure 28 provided with apertured ears 32-32 which are secured to the aforementioned dust-proof plate i5 which is stationarily secured to the housing i6.

A tube 33 extends from the barrel 23 to one of the pressure responsive mechanisms 10). is the actuator .35 which may be matic or mechanical type.

It can now be seen, that is operated and the shoes |8-|8 into engagement with the drum l3,

of the pneuwhen the actuator 35 are brought the tendency of the drum and wheel is to switch the brake mechanism, and in the present inv permitted with a slight limit suffic in a slight twist of the plate l1.

ention this is lent to result 34 (see Fig. 4 Between the upper ends of the shoes lB |8 This results in an application of force against the nipple structure 28 which in moving inwardly will displace some of the liquid contents of the barrel 23, this being forced under pressure through the corresponding tube 33. The fluid under pressure enters the semi-circular shaped fiat tube 31 which is supported by the bracket 38, the outer end of the tube 31 being free and closed as at 39.

Numeral 49 generally refers -;to the indicator instrument which has been placed on the dash board of an automobile in view of the driver, and this consists of the open front casing 4|. This casing is provided on its front withthe. panel 42 having the opening 43-43 therein 'and'behind which dials are placed. Each ofv these. dials and its associated mechanism, represents one instrument, the instrument on the left for'testing" the left wheels while the instrument on the right is for testing the right wheel brakes. As both instruments are or" thesame construction, a description of one will umce for both.

' The instrument on the right includes a rotat-' able barrel 44 journalled through the rear wall of the casing 4| and having on its rear end a gear 45. This gear45 meshes with the quadrant rack 46 swingably mounted as at 41 and this rack 46 is connected to the free end of the pressure tube 31 by the pivot link 48. 7

Extending through this barrel 44 and extending both forwardly and rearwardly thereof isthe shaft 49 which is journalled through the rear bearing 59(- The rear endportionof this shaft 49 is equipped with a gear which can mesh with the quadrant rack 52, the'latter being swing ably supported and'connected by the link 53 to the pressure-tube -31 of the corresponding pressureiespohsive mechanism 343- v Y The 'itube 33 extending fro the right rear brake lads'to the mechanisrn 31 which operatesthe shaft 49am the tube as 'whieh leads from the right front brake communicateswith the mechanism 34 which operates the barrel 24. Secured to the "shaft 49 and barrel 44 within the confines ofthe casing 4| are the indicator arms 54 and 55. For each of these arms 54 and 55 there is amarke'rhand 55, the samebeing pro-' vided at its outer end withalug 5[ against which the corresponding indicator, .arm',.can engage when in motion to move the hand '56 tofa set position.

carries an upwardly and The inner end portion of each hand 56 is provided with a spring extension 58 disposed backwardly, the hand 56 for the arm 54, bearing 58, tensionally engaging the pane 59 while the spring 58 on the hand 56 associated with the arm 55 tensionally engages the rear wall of the casing 4|.

Thus it can be seen, that when the arms 54 and 55 operate, the marker hands 56 are carried therewith" and left at the extreme position of movement ofthe arm where they remain due to the frictional engagement of the springs 58 with the pane 59 or rear wall of the casing 4|.

Fig. 11 discloses a resetting element which consists of the sleeve 60 on the forward end of the shaft 49. opening in the pane 59 around the shaft 49 and outwardly extending member 6| which is engageable with both of the hands 55. Obviously by rotating the sleeve 60, the member 6| will return the hand to zero position. Y

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numero us changes in the shape, size and materials may be resorted to without de parting from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what I claim-as new is:-- e I In combination, a rotary shaft, a drum adapted torotate with the shaft, a tie' plate having an openingtherein through which the shaft extends and" rotates, said'tie plate being mounted for limited rotary movement, a' pair of brake shoes in the said drum, each of said shoes having one of its ends pivotally {connected to the same end of the tie plate, a'npperator interposed between the remaining ends of'theshoes said plate, ad--. jacentits end to, which the shoes are pivotally onnected',being provided'with an opening, a sta.-.

tionarily'inounted dash pot having a fluid con-.

tent and a fluid outlet, said dash pot including a shell closed at oneend and a piston operative within the other end thereof, said shell, at one end, beingprovided with a boss for engaging the tie plate at one end of the last mentioned opening therein, and a boss on the outer end of the piston for engaging the'ti'e plate at the opposite end of the last mentioned opening.

- WILLIAM A. ROSS.

This sleeve extends through an e 

